Universal attachment for lathes



' Oct. I4, I930. A. F. GRONWALD Y 1,778,494

UNIVERSAL ATTACHMENT FOR LATHES Filed Jan. 16, 1929 2 Sheets-Sheet lFigure2isapartial front view showing the justment of slide 18 isperformed by means Patented a. 14, 1930 1,778,494

UNITED STATES PATENT OFFICE AUGUST FRIEDRICH GRONWALD, OI ZINTEN,GERMANY UNIVERSAL ATTACHMENT non LATHES Application filed January 16,1929, Serial No. 332,818, and in Germany March 24, 1927.

My invention relates to an universal attach- 11 securely fastened onslide 9. The threadment for lathes, it is of a simple construced spindle10 is worked by means of handle 12. tion, can be attached to all lathesof usual Two plates numbered 13 connect the handle build, and permitsthe lathe to be used as 12 with the threaded spindle 10,they are proanuniversal machine tool for many purposes vided with bore holes throughwhich the for which hitherto special machine tools shaft of spindlepasses and revolve freely were a necessity. Further, the attachmentaround spindle 10 above and below the ratchet enables in most instancesthe changing of wheel 14 which is securely fixed to the shaft toolswithout removing the work-piece. of spindle 10. Between the two plates13 two 10 The nature of my invention and its disratchets or detents 15are placed on hinges. 60

tinguishing features and advantages will They are operated through nut16. Accordclearly appear as the description proceeds. ing to thedirection nut 16 is turned, one or Reference is to be had to theaccompanythe other of the ratchets or detents 15 is put ing drawingsforming a art of this specifiinto action and grips into the teeth of the15 cation, it being understoo that the drawings ratchet wheel 14. Slide9 can then, accordare merely illustrative of one example of the ing tothe way nut 16 is set, be raised or invention. lowered by moving handle12.

Figure 1 is a front view of the attachment For slide 18 a horizontalguide way 17 is embodying my invention. provided on the surface of slide9. The ad- 70 use of the attachment for a special purpose. of crank 19which turns the threaded spindle Figure 3 is a plan view. 20 havingthreaded engagement with nut 21 Figure 4 is a side view. located on thebottom side of slide 18. If Figure 5 is a partial side view showingslide 18 is not required it can be dismounted the use of the attachmentfor a special purtogetherwith threaded spindle 20 and crank 75 ose. 19.p Figure 6 is a vertical section of the attach- Ifthe attachment is tobe used as a vise for ment on line 66 of Figure 3. holding work-pieceson which work is to be Figure 7 is a horizontal section on line 7-7performed with milling or grinding tools of Figure 1. placed between thestocks of the lathe, slide 30 Similar numbers refer to similar parts 18serves as the movable vise jaw, as illusthroughout the several views.t-rated in Figure 2, and as fixed vise jaw In the drawings: 1 is a lathecarriage serves part 22 placed from the other end on to mounted in theusual way on the bed of the horizontal guide 17 and fastened there inthe lathe, 2 is a slide movable transversely of the usual way. bed bymeans of crank 3. On this slide 2 and Tools can be fastened on to slide18 by united with it is a base 4: for mounting, turnmeans of clamp plate23 in connection with ing and fixing the attachment. All these clamp nut24. For adjusting the horizontal parts being common to lathes in generaluse. position screw 25 is provided. In this way, Numeral 5 represents abase plate or socle for instance, a turning tool can be fastened locatedon the vertical guide way 6,it revolves as shown in Figure 5, and theelevation rein the usual way on base 4 by means of pin quired for theedge of tool 26 in regard to 7 fastened to its bottom side and can befixed the work-piece can be adjusted by operating on base 4 in anyposition desired by means handle 12. Cranks 8 and 19 serve to regulateof screw holes 8. the advance. On guide way 6 is slide 9 vertically mov-The numeral. 27 indicates a block which able. The elevation is performedby means can also be secured to slide 18 by means of of the threadedspindle 1O revolvably fasclamp plate 23. For greater security two tenedto the base plate or socle 5 having pins are mounted on its undersideadapted 0 threaded engagement with the bore of nut to enter bore-holeson slide 18. Block 27 serves as e301. holder for rod shaped tools suchas drills, broaches, etc. For this purpose it is provided with a conicalbore for the reception of the tool.

In Figure 1 it is clearly shown how block 27 can be used to hold agrooving tool 28, a rod with a projecting blade on its end. Accordingtov the groove required, the breadth of the blade is chosen. 7 Groovingtool 28 is put into motion by means of crank 19 and supported during itsactivity by idler 30 revolving on adjusted in regard to height. Frame 32is fastened to slide 9, it can be removed.

On the back of slide 9, on its side surface 33, the detachable table 34is mounted. As

shown in Figure 3 without work-piece and.

in Figure 4 with work-piece 35, this table serves principally forholding long workpieces such as shafts, axles, spindles, into which agroove is to be cut or on which other Work is to be performed. To securea safe position for round work-pieces on table 34 its surface isprovided with a longitudinalgroove 36. The hoops 37 on both ends of thetable hold the work-piece securely when screwed together with plates 38fastened to the lower side of thetable. To admit grooves to be outwithout hindrance, the hoops are open on the top.

Numeral 39 indicates a swinging part of table 34 secured in thepositiondesired by means of cones 40 and screws 41, This swinging part 39 isprincipally designed for hold-v ing such work-pieces which must beplaced inv an inclined position when worked on. It is clearly shown inFigure 6 that in this Way,

for instance, bevel wheel 42 can be fastened V to the swinging part 39by means of screw 43 passing through bore 44 in part 39. A horizontallyacting tool can then be used on the workng face of the bevel wheel 42. 7It is only necessary to turn the bevel wheel when work on one tooth isfinished until the next tooth is in the proper position. Part 39 can beswung so far that it stands vertically to the surface of table '34. Spurwheels can then be fastened to it and worked on by horizontally actingtools. Spur wheels can also be worked on by placing them on a shaft andfastening the shaft on table 34 as illustrated with shaft 35 in Figure4. v

Besides the examples described and illustrated the attachment can beused in many other ways should circumstances demand it. I would state inconclusion that while the illustrated examples constitute a practicalembodiment of my invention, I do not limit myself strictly to the exactdetails herein illustrated, since, manifestly, the same can be slidehorizontally adjustable on said first 7 Slide andhaving means forholding tools and work-pieces. Y

2. In a lathe, the combination of a lathe carriage having a base whereona lathe attachment may be mounted, withan attachment consisting of avertical guide piece having a base plate or socle adapted for beingplaced on and secured to the base of the lathe carriage, a slidevertically adjustable oncthe guide. piece, a nut upon said slide, aratchet key turning a threaded spindle revolvably fastenedto the baseplate or socle ofthe vertical guide piece and having threaded engagement with said nut 1n the vertical slide and a second slide abovesaid first slide hori zontally adjustable on said first slide. f'

In testimony whereof I afiix my signature.

AUGUST FRIEDRICH GRONWALD.

